A deal to ensure supplies for the current winter expires at the end of this month, and that agreement was only agreed after tense negotiations against the backdrop of the war in eastern Ukraine.

The new talks involving the Ukrainian and Russian energy ministers as well as the EU energy commissioner laid down the basis for continuing the discussions in April, a joint statement said.

"The parties agreed that preparations for the supply for the next winter have to start now," the statement said.

Russia will consider a request to grant Ukraine a discount and Ukraine will seek to purchase enough gas to fill its storage tanks while ensuring transit of supplies toEurope, it said.

The European Commission, the powerful executive for the 28-country EU, will do its best to help cash-strapped Ukraine find "adequate financial support to purchase gas," it added.

An EU official said earlier this week that Brussels has set June as a target to clinch a new gas deal.

With a deal for the current winter expiring at the end of March, Ukraine can ensure its gas supplies in the intervening months through reverse flows from EU states.

But officials added Russian gas imports will be needed to replenish reserves to the level of 20 billion cubic metres, the quantity needed to secure both supplies for Ukraine and the transit of gas to EU countries through next winter.

Fifteen percent of Europe's gas transits Ukraine.

The EU hopes the deal it will end up brokering with Russian Energy Minister Alexander Novak and his Ukrainian counterpart Volodymyr Demchyshyn will last through the autumn of 2016.

That is the date, the EU official said, when an international arbitration panel in Stockholm is due to rule on a dispute between the two sides which erupted after the Ukraine crisis.